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Optical layered body, polarizer and image display device

a technology of optical layers and polarizers, applied in the direction of polarising elements, instruments, synthetic resin layered products, etc., can solve the problems of deterioration of image color reproducibility and image deterioration, and achieve the effect of superior antistatic performan

Active Publication Date: 2010-11-23
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0171]Since the optical layered body of the present invention has the constitution described above, it is superior in antistatic performance, an antiglare property and color reproducibility. Therefore, the optical layered body of the present invention can be suitably applied to cathode ray tube (CRT) display devices, liquid crystal displays (LCD), plasma displays (PDP), and electroluminescence displays (ELD).

Problems solved by technology

However, formation of an optical layered body including such an antiglare layer superior in light transmittance and image sharpness and a low refractive index layer on an antistatic layer containing ATO, brings to light a problem of deteriorating color reproducibility of images, which has not become a problem due to low transparency.
This problem of deteriorating color reproducibility is a problem that occurrence of coloring and interference fringes due to the interaction between the antistatic layer containing ATO and other layers upon light irradiation to transmit or reflect the light results in deterioration of the color reproducibility of images and outstanding fringes upon placing the optical layered body on the surface of a display.

Method used

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  • Optical layered body, polarizer and image display device

Examples

Experimental program
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Effect test

example 1

Preparation of Composition for Forming Antistatic Layer

[0173]A composition was prepared by adequately mixing the following: materials. This composition was filtrated with a polypropylene filter having a pore size of 30 μm to prepare a composition for forming an antistatic layer.

Antistatic Agent:

[0174]

Antimony doped tin oxide dispersion60parts by weight(produced by Nippon Pelnox Corporation,a methyl ethyl ketone dispersion)solid contentDiffusion filler (silica particle):Nonspherical silica (average particle8.5parts by weightsize: 2.0 μm)Ultra violet curable resin:Hexanediol diacrylate (HDDA)15parts by weightPentaerythritol triacrylate (PETA)85parts by weightPhotopolymerization initiator:Irgacure 184 (produced by Ciba5.0parts by weightSpecialty Chemicals Inc.)Solvent:Cyclohexanone30parts by weightMethyl isobutyl ketone70parts by weight

Preparation of Composition for Forming Antiglare Layer

[0175]A composition was prepared by adequately mixing the following materials. This composition wa...

example 2

[0181]An optical layered body having an antiglare property, which comprises a light-transmitting substrate, an antistatic layer, an antiglare layer and a low refractive index layer, was formed in the same manner as in Example 1 except for using a mixture of diffusion filler formed by adequately mixing the following compositions in place of the diffusion filler (nonspherical silica) in the composition for forming an antistatic layer in Example 1.

[0182]The resulting optical layered body was similarly visually observed under illumination for inspection, and consequently it was confirmed that interference fringes were not formed and coloring due to interference did not occur.

Diffusion Filler (Silica Particles, Organic Resin Beads):

[0183]Nonspherical silica (average particle size: 2.0 μm)

[0184]3.5 parts by weight

[0185]Styrene-acrylic copolymer beads (average particle size: 3.5 μm) 5.0 parts by weight

reference example 1

[0187]An optical layered body having an antiglare property, which comprises a light-transmitting substrate, an antistatic layer, an antiglare layer and a low refractive index layer, was formed in the same manner as in Example 1 except for adding the diffusion filler (nonspherical silica) 22 parts by weight in the composition for forming an antistatic layer in Example 1. The resulting optical layered body was similarly visually observed under illumination for inspection, and consequently it was confirmed that interference fringes were not formed and coloring due to interference did not occur.

[0188]Also in the optical layered body in each of Examples 1 and 2, Comparative Example 1, and Reference Example 1, upon forming the antistatic layer, with respect to the surface of the antistatic layer, a mean spacing Sm of the surface roughness, a mean angle of inclination θa of the surface roughness, and a ten-point mean roughness Rz of the surface roughness were measured by the method defined...

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Abstract

It is an object of the present invention to provide an improved optical layered body with reduced scintillation, gloss blackness, color effects and interference fringes, while maintaining antistatic and antiglare performance.The optical layered body comprises, in order, an antistatic layer, an antiglare layer and a low refractive index layer on a light-transmitting substrate,The antistatic layer is a thin resin layer containing antimony-doped tin oxide and a diffusion filler, and having a predetermined surface roughness on its surface.

Description

TECHNICAL FIELD[0001]The present invention relates to an optical layered body, a polarizer and an image display device.BACKGROUND ART[0002]An optical layered body including functional layers having various functions is provided on the outermost surfaces of image display devices such as cathode ray tube (CRT) display devices, liquid crystal displays (LCD), plasma displays (PDP), and electroluminescence displays (ELD) (Japanese Kokai Publication 2006-126808, Japanese Kokai Publication 2004-69867, Japanese Kokai Publication 2005-107005, and Japanese Kokai Publication 2006-95997). As such an optical layered body, an optical layered body having a layered structure illustrated in FIG. 1, in which an antistatic layer, an antiglare layer and a low refractive index layer is placed in this order on a substrate, are known. This optical layered body has excellent performance in an antistatic property, an antireflection property, and an antiglare property.[0003]In the antistatic layer in such an...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B5/02B32B7/02B32B27/18G02B1/10G02B1/11G02B1/116G02B1/16G02B5/30G02F1/1335
CPCG02B5/0215G02B5/0226G02B5/0242G02B5/0278G02B2207/121
Inventor IWATA, YUKIMITSUFURUI, GENKODAMA, TAKASHIHAYASHI, MARIKOYOSHIDA, SANAEITOH, KIYOSHI
Owner DAI NIPPON PRINTING CO LTD
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